in src/main/java/com/googlesource/gerrit/plugins/serverconfig/ServerConfigServlet.java [133:146]
private void respondInvalidConfig(HttpServletRequest req,
HttpServletResponse res, String messageTxt) throws IOException {
String message =
MessageFormat.format("Invalid config file {0}: {1}", req.getPathInfo(),
messageTxt);
res.setStatus(HttpServletResponse.SC_BAD_REQUEST);
res.setContentType("application/octet-stream");
res.setContentLength(message.length());
byte[] bytes = message.getBytes(Charsets.UTF_8);
OutputStream out = res.getOutputStream();
try (ByteArrayInputStream in = new ByteArrayInputStream(bytes)) {
ByteStreams.copy(in, out);
}
}